Positive, Negative & Interrogative Forms
The underlined words are the verbs. The verbs show the actions of the subjects (things or people). The subjects are doing the actions now or at the moment.
We use to be + verb-ing to show actions or activities happening now.
The following is the pattern of the sentences above.
To be (am/ is / are) + Verb -ing is the form of present continuous tense. Look at the following table for more details.